*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
.gallerybox{
  padding-bottom: 30px;
}
.twoline{
  display: flex;
  justify-content: space-between;
}
.img-fluid{
  margin-bottom: 20px;
}

/* 响应350px */
@media screen and (max-width:351px) {
  .twoline{
    display: block;
  }
}